What is the difference between copper and wrot copper when doing a plumbing repair?

I am doing a plumbing repair, and on the Grainger website I can get the supplies I need in copper and wrot copper. I just want to make sure, before I purchase the wrot copper, that it works just as well as regular copper, and can be sweat just like regular copper. Is there any difference between the 2 that I need to know?